Physical Science Semester Exam

Mendeleev arranged the known chemical elements in a table according to increasing

• atomic number

• number of electrons

• number of protons

• mass

When Mendeleev organized his periodic table in order of increasing mass, elements with similar properties were in the same

• column

• period

• row

• space

Moving from left to right across the period table, which of the following values increases by exactly one from element to element?

• isotope number

• atomic number

• atomic mass unit

• mass number

The usefuleness of Mendeleev's periodic table was confirmed by

• the discovery of subatomic particles

• its immediate acceptance by other scientists

• the discovery of elements with predicted properties

• the discovery of the nucleus

The standard on which the atomic mass unit is based is the mass of a

• proton

• neutron

• chlorine-35 atom

• carbon-12 atom

The atomic mass of an element is

• the sum of the protons and neutrons in one atom of the element

• twice the number of protons in one atom of the element

• a ratio based on the mass of a carbon-12 atom

• a weighted average of the masses of an element's isotopes

The unit for atomic mass is

• gram

• amu

• pound

• none of the above

At room temperature, none of the metals are

• soft

• liquid

• malleable

• gases

Which general statement does NOT apply to metals

• most metals are ductile

• most metals are malleable

• most metals are brittle

• most metals are good conductors of electric current

Atoms of the most reactive elements tend to have

• one or seven valence electrons

• eight valence electrons

• four or five valence electrons

• no valence electrons